Grinding-machine.



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PATENTED MAY 23, 1905.

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APPLICATION FILED DBO. s. 1904.

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No. 790,705. PATENTED MAY 23, 1905.

E. 0. SGHRADBR. GRINDING MACHINE.

APPLICATION FILED DBO. 8, 1904.

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HNVENTOR 1 II a-ulelwaA-ac, q %s PATENTED MAY 23, L905.

E. G. SGHRADER. GRINDING MACHINE.

AEPLIOATION FILED DEO.8, 1904.

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STATES Patented May 23, 1905.

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GRINDING-MACHINE.

SPECIFICATION forming part of Letters atent No. 790,705, dated May 23, 1905.

I Application filed December 8,1904. Serial No. 236,005.

.T 0 (LZZ whom it may concern.-

Be it known that I, ERNEST O. SGHRADER,

a citizen of the United States, residing at Knoxville, in the county of Allegheny and State of Pennsylvania, have invented or discovered certain new and useful Improvements in Grinding-Machines, of which improvements the following is a s ecification.

The invention describe herein relates to certain improvements in machines for grinding tumblers, &c., and has for its object the arrangement of a series of two or more grinding mechanisms each consisting of a rotating holder and a reciprocating but non-rotating abrader in such manner that while all are accessible to the operator from one position he need not reach over a rotating or moving part of one mechanism to remove and replace articles in another mechanism.

It is a further object of the invention to provide for the automatic back-and-forth movement of the abrader and the automatic discharge of the article from the holder.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification, Figure 1 is a top plan view of my improved machine. Fig. 2 is a side elevation of the same. Fig. 3 is a longitudinal section, on an enlarged scale, of one of the mechanisms. Figs. 4, 5, and 6 are detailed views illustrating the discharging device and the manner in which it operates.

In the practice of my invention a series of two or more power-driven shafts 1 are mounted in suitable bearings 2, arranged in parallel lines on a bedlate 3 and preferably adjacent to one en of the bed-plate. On these shafts are loosely-mounted pulleys 4., provided on one side with one member, 5, of clutch mechanisms, the other member, 6, being mounted on the shafts in such manner as to permit its movement longitudinally of the shaft while causing the shaft to rotate therewith. The preferred construction of the clutch mechanisms consists of a conical block 5, formed integral with or secured to the pulley, and a shell 6, having an interior contour corresponding to the exterior contour of the block. The shell is provided with a grooved hub 7, and pins 9 on an arm 8 engage the groove, so as to permit the shell and hub to rotate, but capable of being shifted by the arm. The shell 6 is normally pressed toward the block 5 by a spring 10, surrounding the shaft and bearing at its ends against the hub and one of the bearings 2, respectively. While the shifting of the arm 8 may be effected in any desired manner, it is preferred that it should occur simultaneously with the shifting of the abrading-block, as hereinafter described. To this end provision is made whereby the arm 8 and the movable member of the clutch can be operated by the rod 11, through which the movement of the abrader is effected. A suitable construction to this end consists of a cam 12, pivotally mounted on one end of a slide 13, which is in engagement at its opposite end with the arm 8. This slide 13 passes through one of the standards of the bearings, and the cam is arranged so as to bear in certain positions thereof against the front face of said standard. 011 the shaft 14, which is mounted in the slide and to which the cam is secured, is provided an arm 15, projecting down alongside of the rod 11 and in the path of movement of a pin 16 on said rod. In the position of the parts shown in Fig. 2 the point of greatest eccentricity of the cam bears against the standard and the member 6 of the clutch is drawn away from the block 5, compressing the spring 9. As the rod 11 moves to the left the pin 16 will strike one of the prongs of the arm 15 and shift the cam, so as to permit the spring 9 to shift the movable member 6 of the clutch into engagement with the block 5. As the bar 11 moves in the opposite direction, or to the right, the pin 16 will strike the other prong on the arm 15 and so shift the cam that it will bear upon the standard and pull back the slide and lever 8, drawing the movable member 6 away from the block 5. In order to stop the rotation of the shaft as soon as the members of the clutch are separated, a suitable brake is provided, which in the construction shown consists of a bearing -block 17, having an inclined face lying in the path of movement of the movable member 6, which is brought into contact with this braking-block as it is moved away from the block 5. On the inner end of the shaft 1 is secured a holder 18 for the articles to be ground. In order to discharge the articles from the holder, plunger 19 is arranged on the end of the stem 20, passing through the shaft 1, and on the rod 11 is mounted an arm 21, projecting up into alinement with the rod or stem 20. This arm 21, as shown in Figs. 4, 5, and 6, is mounted on the rod 11 with a certain freedom of rotation and will normally stand in such position that when the rod 11 is moved to the right the u per portion of the arm will bear against t e rod 20 and force such rod, with the plunger, to the right, pushing out such article. As the arm approaches the limit of its movement to the right an inclined surface 22 thereon will bear a ainst the beveled surface 23 on the standard of the rear bearing and swing such arm out of alinement with the stem 20, permitting the plunger and stem to be pushed to the left on an insertion of another article into the holder.

The abrading-block 24 is secured to a shaft 25, mounted with a freedom of longitudinal movement in a carrier 26. This carrier is secured to the rod 11 and an auxiliary supporting-rod 27, mounted in bearings 28 on the bed of the machine, so that by the back-and-forth movement of the rod 11 the abrading-block is moved toward and from the holder. In order that the abrading-block may be yieldingly held to its work, a spring 29 is arranged around the shaft and bears at its ends against a portion of the supporting-block or carrier and a collar 30, secured to the shaft 25. While the shaft may be held as against rotation in any suitable manner, it is preferred to effect this function by means of an arm 31 on the collar engaging a rib 32 on the carrier-block, the end of the arm being slotted for the rece tion of the rib. The car rier, with the abra ing-block, is moved back and forth by means of a cam 33 on the shaft 34,which is driven,bymeans of the pulley 35, through the worm and worm-wheel gearing 36, as shown. The cam in its rotation will strike against a lever 37, pivotally mounted to the frame and connected at its upper end by link 38 to the sliding rod 11. The lever is also provided with a weighted arm 39, whereby its upper end can be moved out ward, so as to pull the carrier with the abrading-block toward the holder. The movement of the carrier and its abrading-block away from the holder is effected by the cam, and simultaneous with this movement of the carrier the clutch mechanism connecting to the shaft 1 with its driving-pulley is shifted to free the shaft from the pulley and check the rotation of the shaft, and the pusher is operated to force the article out of the holder. The cam is so constructed ,as to hold the parts in inoperative position for a'sufficient be withdrawn and a new article to be inserted in the holder, when the cam permits the weighted arm to shift the carrier toward the holder and the movable member of the clutch mechanism into an engagement with the block 5. In order to limit the grinding action, a stop 40 is secured to the rod 11 in such position that when a sufficient grinding has been effected it will come into contact with one of the bearings 28 and limit the further movement of the carrier and the abrading-block to the left.

A series of mechanisms such as described are arranged upon the bed ofthe machine, one a little in advance of the other across the machine. By this construction all of the belts on the pulleys 2 can be led to a'single wide pulley on the driving-shaft above. All of the cams are arran ed on a single shaft in such positions as to shift the carriers of the several mechanisms in succession, and it is a characteristic of the arrangement shown and described that the oint at which an operator would have to readh over one-of more of the mechanisms to remove an article and replace another corresponds to the position of the stationary grinder of the intervening mechanisms at that time-as, for example, if the carrier of mechanism 0 is drawn back, so as to permit the discharge of the article and the replacing of another the carriers of mechanisms A and B will be shifted to the left, so that the operator does not reach over a moving part to remove an article. It is preferred that the abrading-block should besurrounded with a protecting-shell 41, which at its open end will extend beyond the abrading-block, so as to prevent the water, 860., from flying out during the grinding operation.

I claim herein as my invention- 1. A grinding-machine having in combination a series of two or more rotating holders, a series of two or more movable abraders, a shaft and means operative by said shaft for reciprocating the abraders in sequence, substantially as set forth.

2. A grindingmachine having in combina tion a series of two or more shafts, holders mounted on said shafts, pulleys loosely mounted on the shafts, clutch mechanisms for connecting the pulleys to the shafts, two

or more movable abraders, a shaft and means operative by the shaft for shifting the clutch mechanisms and the abraders in sequence, substantially as set forth.

3. A grinding-machine having in combination a shaft, a holder secured to the shaft, a pulley loosely mounted on the shaft, a clutch mechanism for connecting the pulley to the shaft, a braking-block, a movable abrader, and means for shifting the abrader, and the movable member of the clutch against the braking-block, substantially as set forth.

4. A grinding-machine having in combination a shaft, a holder secured to the shaft, a pulley loosely mounted on the shaft, a clutch mechanism for connecting the pulley t0 the shaft, a pusher extending through the shaft, a braking-block, and means for shifting the movable clutch member against the block and for shifting the pusher, substantially as set forth.

5. A grinding-machine having in combination a driven shaft, a holder secured to the shaft, a pusher extending through the shaft, a sliding rod, an abrader movable by the rod, a pusher-arm carried by the rod, and means operative by the rod for effecting the engagement and disengagement of the shaft from ifts pllriving mechanism, substantially as set ort my hand.

E. C. SCHRADER. Witnesses:

CI-IARLEs BARNETT, HERBERT BRADLEY. 

